From 29f9361073051e8d45d14323542059165690d4bc Mon Sep 17 00:00:00 2001
From: Patrick MARIE <pm@mkz.me>
Date: Wed, 20 Mar 2024 23:30:01 +0100
Subject: [PATCH] Adding a POC around helm

---
 .gitignore            |  3 +--
 helm-poc/default.nix  | 25 +++++++++++++++++++++++++
 helm-poc/nix/helm.nix | 31 +++++++++++++++++++++++++++++++
 3 files changed, 57 insertions(+), 2 deletions(-)
 create mode 100644 helm-poc/default.nix
 create mode 100644 helm-poc/nix/helm.nix

diff --git a/.gitignore b/.gitignore
index 4c8c616..fcfc4a1 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,2 +1 @@
-result
-
+result*
diff --git a/helm-poc/default.nix b/helm-poc/default.nix
new file mode 100644
index 0000000..f3dfe61
--- /dev/null
+++ b/helm-poc/default.nix
@@ -0,0 +1,25 @@
+{
+  pkgs ? import <nixpkgs> {}
+, helmnix ? import ./nix/helm.nix {}
+, lib ? pkgs.lib
+}:
+let
+  charts = [
+    rec {
+      name = "kube-prometheus-stack";
+      version = "57.0.3";
+      url = "https://github.com/prometheus-community/helm-charts/releases/download/${name}-${version}/${name}-${version}.tgz";
+      hash = "sha256-oZNaFSfFR2dtf5IMUQ0CnXQeVLvoW22JdRqMmgmdtTs=";
+    }
+    rec {
+      name = "cert-manager";
+      version = "v1.14.4";
+      url = "https://charts.jetstack.io/charts/${name}-${version}.tgz";
+      hash = "sha256-V3X9vBiB1uUQ33bTh1OvVLhr0Uyqjtso/bt5UnBC3t4=";
+    }
+  ];
+
+  packages = builtins.map (chart: helmnix.mkHelm chart) charts;
+in
+  packages
+
diff --git a/helm-poc/nix/helm.nix b/helm-poc/nix/helm.nix
new file mode 100644
index 0000000..d0670af
--- /dev/null
+++ b/helm-poc/nix/helm.nix
@@ -0,0 +1,31 @@
+{
+  pkgs ? import <nixpkgs> {}
+, helm ? "${pkgs.kubernetes-helm}/bin/helm"
+, lib ? pkgs.lib
+}:
+let
+  mkHelm = { name, version, url, hash ? lib.fakeSha256 }:
+    pkgs.stdenv.mkDerivation {
+      inherit name;
+
+      src = pkgs.fetchurl {
+        inherit url hash;
+      };
+
+      phases = [
+        "unpackPhase"
+        "build" 
+      ];
+
+      build = ''
+        mkdir -p $out
+        ${helm} template ${name} ./ > $out/${name}-${version}.yaml
+        #${helm} version > $out/README 
+      '';
+    };
+
+  nixHelm = { 
+    inherit mkHelm;
+  };
+in
+  nixHelm